Unit 2: Supply, Demand, and Consumer Choice

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Unit 2: Supply, Demand, and Consumer Choice
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Presentation transcript:

Unit 2: Supply, Demand, and Consumer Choice Do you see the cow?

Review Explain the Law of Demand Explain the Law of Supply Identify the 5 shifters of demand Identify the 6 shifters of supply Define Subsidy Explain why price DOESN’T shift the curve Define Equilibrium Define Shortage Define Surplus Identify 10 stores in the mall

Putting Supply and Demand Together!!!

Supply and Demand are put together to determine equilibrium price and equilibrium quantity Supply Schedule Demand Schedule S $5 4 3 2 1 P Qd $5 10 $4 20 $3 30 $2 50 $1 80 P Qs $5 50 $4 40 $3 30 $2 20 $1 10 D o 10 20 30 40 50 60 70 80 Q 4

Equilibrium Price = $3 (Qd=Qs) Equilibrium Quantity is 30 Supply and Demand are put together to determine equilibrium price and equilibrium quantity P Supply Schedule Demand Schedule S $5 4 3 2 1 P Qd $5 10 $4 20 $3 30 $2 50 $1 80 P Qs $5 50 $4 40 $3 30 $2 20 $1 10 Equilibrium Price = $3 (Qd=Qs) D o 10 20 30 40 50 60 70 80 Q Equilibrium Quantity is 30 5

What if the price increases to $4? Supply and Demand are put together to determine equilibrium price and equilibrium quantity What if the price increases to $4? P Supply Schedule Demand Schedule S $5 4 3 2 1 P Qd $5 10 $4 20 $3 30 $2 50 $1 80 P Qs $5 50 $4 40 $3 30 $2 20 $1 10 D o 10 20 30 40 50 60 70 80 Q 6

How much is the surplus at $4? At $4, there is disequilibrium. The quantity demanded is less than quantity supplied. P Supply Schedule Demand Schedule S $5 4 3 2 1 Surplus (Qd<Qs) P Qd $5 10 $4 20 $3 30 $2 50 $1 80 P Qs $5 50 $4 40 $3 30 $2 20 $1 10 How much is the surplus at $4? Answer: 20 D o 10 20 30 40 50 60 70 80 Q 7

How much is the surplus if the price is $5? What if the price decreases to $2? P Supply Schedule Demand Schedule S $5 4 3 2 1 P Qd $5 10 $4 20 $3 30 $2 50 $1 80 P Qs $5 50 $4 40 $3 30 $2 20 $1 10 Answer: 40 D o 10 20 30 40 50 60 70 80 Q 8

How much is the shortage at $2? At $2, there is disequilibrium. The quantity demanded is greater than quantity supplied. P Supply Schedule Demand Schedule S $5 4 3 2 1 P Qd $5 10 $4 20 $3 30 $2 50 $1 80 P Qs $5 50 $4 40 $3 30 $2 20 $1 10 How much is the shortage at $2? Answer: 30 Shortage (Qd>Qs) D o 10 20 30 40 50 60 70 80 Q 9

How much is the shortage if the price is $1? Supply Schedule Demand Schedule S $5 4 3 2 1 P Qd $5 10 $4 20 $3 30 $2 50 $1 80 P Qs $5 50 $4 40 $3 30 $2 20 $1 10 Answer: 70 D o 10 20 30 40 50 60 70 80 Q 10

The FREE MARKET system automatically pushes the price toward equilibrium. Supply Schedule Demand Schedule S $5 4 3 2 1 When there is a surplus, producers lower prices P Qd $5 10 $4 20 $3 30 $2 50 $1 80 P Qs $5 50 $4 40 $3 30 $2 20 $1 10 When there is a shortage, producers raise prices D o 10 20 30 40 50 60 70 80 Q 11

Shifting Supply and Demand

Assume shifts in supply or demand change equilibrium P and Q instantaneously 13

Supply and Demand Analysis Easy as 1, 2, 3 Before the change: Draw supply and demand Label original equilibrium price and quantity The change: Did it affect supply or demand first? Which determinant caused the shift? Draw increase or decrease After change: Label new equilibrium? What happens to Price? (increase or decrease) What happens to Quantity? (increase or decrease) Let’s Practice!

S&D Analysis Practice Analyze Hamburgers Before Change (Draw equilibrium) The Change (S or D, Identify Shifter) After Change (Price and Quantity After) Analyze Hamburgers Price of sushi (a substitute) increases New grilling technology cuts production time in half Price of burgers falls from $3 to $1. Price for ground beef triples Human fingers found in multiple burger restaurants. 1. Demand Increases 2. Supply Increases 3. No Shift. Shortage 4. Supply Decreases 5. Demand Decreases

Double Shifts Suppose the demand for sports cars fell at the same time as production technology improved. Use S&D Analysis to show what will happen to PRICE and QUANTITY. If TWO curves shift at the same time, EITHER price or quantity will be indeterminate.

Use a S&D to explain this double shift 17